I had a very active hummingbird presence last year, and couldn't wait for the same to occur this year. I have a vast garden with many plants known to attract these birds... Columbine, Phlox, Penstemon, Trumpet Vine, Cardinal Vine, Cypress Vine, Monarda, Pentas, Lobelia, etc. I started hanging my hummingbird feeder in April .( I live in zone 6 and wanted to be sure not to miss them.) I keep it meticulously clean, and change the food every 2-3 days... EVERY day when it is extremely hot! My recipe is 4:1 , water to sugar. I have seen them several times since I hung the feeder; actually, I saw the first one in late April. But now, I do not see them for periods of time... and only infrequently. It is now July 11th, and I haven't spotted one for days!! I am able to observe my feeders/garden a lot during the day, since I have a great view of it. What is happening to them? Where are they this year? Anybody have any knowledge or explanation of this? I really am a "bird person" and am sooo disappointed in their absence! It really makes my day when I see them. Looking forward to some feedback.